Actually, those two part numbers you list are both stock speeds. One is the 768mb version and the other is the 1gb version. You can tell by the start of the part numbers.
Also, the updates are for all EVGA GTX 460 cards but the clock increases are only for the stock cards.
Just updated my LAN rig which has GTX 460 SC EE, and my clocks are now running at 800/1600/2000 and its very very nice to be able to get 100% fan on the 460. EVGA has without question the best customer service and customer care for nVidia cards. I would even venture to say they are the best among all the GPU vendors!
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$10 price difference, but I'd be willing to bet those normal GTX460's do the superclocked speed no problem, and $10 gets me a nice meal at chipotle
Also, the updates are for all EVGA GTX 460 cards but the clock increases are only for the stock cards.